Operating mechanism for high voltage switch



April 5, 1966 .1. BERNATT OPERATING MECHANISM FOR HIGH VOLTAGE SWITCHFiled oct. so, 1965 5 Sheets-Sheet 1 April 5, 1966 .1. BERNATT OPERATINGMECHANISM FOR HIGH VOLTAGE SWITCH Filed oct. so, 1955 5 Sheets-Sheet 2@iw m Q um mw u mw W.

April 5, 1966 J. BERNATT OPERATING MECHANISM FOR HIGH VOLTAGE SWITCH 5Sheets-Sheet 3 Filed Oct. 30, 1963 April 5, 1966 J. BERNATT 3,244,326

OPERATING MECHANISM FOR HIGH VOLTAGE SWITCH Filed oct. so, 196s 5sheets-sheet 4 April 5, 1956 J. BERNATT 3,244,826

OPERATING MECHANISM FOR HIGH VOLTAGE SWITCH Filed OCt. 50, 1965 5Sheets-Sheet 5 United States Patent O 3,244,326 @PERTHNG MECHANISM FRI-IlGH VLTAGE SWTCH .oseph Bernatt, Arlington Heights, lill., assignorto S @t C Electric Company, Chicago, Ill., a corporation of DelawareFiled Oct. Sill, 1963, Ser. No. 320,167 11 Claims. (Cl. 20d- 48) Thisinvention relates, generally, to electric circuit makers land breakersand it has particular relation to operating mechanisms therefor. Itconstitutes an improvement over the construction shown in lohn l. Mikosapplication Serial No. 212,613, led Iuly 26, 1962, now Patent No.3,194,928, issued July 13, 1965, and H. l. Barta U.S. Patent No.2,978,558, issued April 4, 1961.

Among the objects of this invention are: To provide for operatingconjointly the poles of a polyphase high voltage switch in a new andimproved manner; to rotate conjointly and in opposite directions a pairof insulator stacks carrying switch blades forming a center break switchconstruction by means of a single link connected to each stack; tooperate the links by a centrally located crank sha-ft; to provide forstopping the crank shaft in overcenter toggle locked positions slightlymore than 180 apart; to rotate the crank shaft through a chain drivemechanism by an operator that can be controlled from a remote point; andto interconnect the crank shafts of the several poles of the polyphaseswitch for rotation about a common axis and in effect for rotation by ashaft extending Iat right angles to the planes containing the axes ofrotation of the pairs of rotatable insulator stacks.

In the drawings:

FIG. 1 is a perspective view of a switch construction embodying thepresent invention, only one pole of the polyphase switch being showntogether with the mounting structure for three poles.

FIG. 2 is a view in end elevation taken generally along the line 2 2 ofFIG. 1.

FIG. 3 is a top plan view of one pole of the polyphase switchconstruction, the switch lbeing shown in the closed position by fulllines and the particular construction shown being that for theintermediate pole.

FlG. 3A is a top plan view of the pedestal assembly for one of thestationary insulator stacks.

FIG. 3B is a sectional view, at an enlarged scale, taken generally alongthe line 3B 3B of FIG. 3A.

FlCG. 4 is ya View, in side elevation, of the lower portion of theconstruction shown in FIG. 3.

FIGS. 4A, 5, 6, 7, 8 and 10 are elevational and sectional views `takengenerally along the lines 4A 4A, 5 5, 6 6, 7 7, 8 3 and '1d-1hrespectively of FIG. 4.

FIG. 6A is a vertical `sectional View taken |generally along Athe line6A 6A of FIG. 6.

FIG. 9 is a view showing certain details of construction oi' the chaindrive mechanism.

FG. 11 is a side elevational view of the lower right portion of thecenter pole, shown in FIG. 1, to illustrate a different operatingmechanism.

FlG. 12 is a view, in end elevation, of the construction shown in FIG.11.

FIG. 13 is a horizontal plan view taken generally along the line 13 13of FIG. 11.

Referring now particularly to FG. 1 of the drawings, it will be observedthat the reference character 1 designates, generally, a polyphase highvoltage switch structure. For illustrative purposes it is pointed outthat the switch structure 1 may be arranged to operate on an alternatingcurrent electric power transmission system operating at a voltage of 230kv. However, it will be understood that the switch structure 1 can beemployed for ICC systems operating at other voltages with suitablemodifications. While the switch structure 1 is intended to employ threepoles for a three phase system, only one of the switch poles is shown,generally, at 2. The others, it will be understood, are duplicates ofthe pole 2. Each pole is arranged to be mounted on the upper side of anelongated structural support 3 each of which is mounted on the upperends of upright structural supports 4 4 that extend upwardly fromconcrete piers 5 5. On the cen-ter upright structural support l there ismounted a switch operating mechanism 6 that may be either manually orremotely controlled. The switch operating mechanism 6 is arranged todrive a vertical shaft 7 for effecting conjoint operation of the severalpoles 2 forming the switch structure 1 in a manner to be described.

Each pole includes stationary insulator stacks iB S that are lmountednear the ends olf the respective structural support 3 and extendupwardly thereform. They are also shown in FIGS. 3 and 4. At their upperends the stationary insulator stacks 8 8 carry line terminals 9 9 towhich line conductors can be connected in accordance with conventionalpractice.

The lower end of each stationary insulator stack 8 is bolted to yacircular metallic mounting plate `10, FIG. 3A, which is welded to theupper end of a support pipe 11 that extends through the respective endof the elongated structural support 3. Adjacent the upper end of `thesupport pipe 11 it extends through and is welded to an upper rectangularsupport plate 12 the ends of which overlie the upper surfaces of topangle members 13 13 which rorm the upper corners of the structuralsupport 3. The corners of the upper support plate 12 are individuallyadjustable as to elevation by hollow ladjustment plugs one of which isshown at 14 in FIG. 3B. Here it will be noted that each adjustment plug14 is threaded in the respective corner of the upper support plate 1.2from, the under side with the head bearing against the upper surface ofthe horizontal liange of the top angle member 13. This provides forindividual adjustment of each corner of the upper support plate 12. Abolt 15 extends downwardly through an inverted cup shaped spacer 16, thehollow adjustment plug 14 and the horizontal flange of the `top anglemember 13. After the proper `adjustment of the position of the uppersupport plate 12 has been made by the adjustment lugs 14, the bolts 15are tightened.

lt is desirable that there be a corresponding adjustment for the lowerend of the support pipe 11 as well as to provide for rigidly securingthe associated stationary insulator stack 8 in position by takingadvantage of the full depth of the box girder truss construction of thestructural support 3. For this purpose a rectangular lower support plate17, FIG. 4A, is bolted to the lower surfaces of the horizontal flangesof bottom angle members 18-18 and the lower end of the support pipe 11projects downwardly through a clearance opening therein. Angle clips19', preferably four, are Welded to the upper side of the lower supportplate 17 in uniform angular spaced relation around the clearance openingand are arranged to receive adjusting studs Ztl provided with footportions 21 between which the lower end of the support pipe 11 issecurely clamped.

Intermediate the stationary insulator stacks 3 8 are rotatable insulatorstacks 22 22. They are suitably journaled at their lower ends on therespective structural support 3. At their upper ends the rotatableinsulator stacks 22 22 carry switch blades 23-23 that are arranged toform a center break switch structure. Also mounted at the upper ends ofthe rotatable insulator stacks 22 22 are mechanism housings 24 24 whichenclose certain switch operating mechanisms as described in the Mikosapplication above referred to. Between the line terminals 9 9 and themechanism housings 24 .message 24 are located circuit interrupters 25-25that are arranged, as described in the Mikos application, to interruptthe circuit between the line terminals 9-9 prior to opening of theswitch blades 23-231 Provision is made, as described hereinafter, forrotating the insulator stacks 22-22 and thereby the switch blades 23-23in opposite directions. For example, as indicated by the arrows Zai-26,the switch blades 23-23 are arranged to be swung to the positions shownby broken lines in FIG. 3 toward the switch open position, thearrangement providing a center break switch construction.

For rotating each of the rotatable insulator stacks 22-22 they areprovided with depending shafts, one of which is indicated at 27 in FIG.5. FIG. 4 shows the arrangement of the shafts 27 and indicates that theyare suitably journaled in the respective elongated structural support 3.It is desirable to limit the rotation of each of the rotatable insulatorstacks 22 in the switch closed and the switch open position. Preferablythe rotation from one extreme position to the other is 102 although itwill be understood that other ranges can be employed. For limiting therotation of each shaft 27 and thereby the respective rotatable insulatorstack 22 and switch blade 23 carried thereby, a stop arm 28 is clampedto the shaft 27 as seen in FIG. 5. The distal end of the stop arm 2S isarranged to engage one or the other of stops 29-29 which are suitablysecured at 30-30 to the re spective elongated structural support 3. Itwill be understood that the stop 29-29 can be differently located on thesupport 3 and the stop arm 28 located in a different position on theshaft 27 with the arrangement being such that the movement of therespective rotatable insulator stack 22 and the switch blade 23 islimited in the manner described. Preferably the stops 29--29 areconstructed to function as shock absorbers to absorb the impact of themoving parts at the ends of the opening or closing strokes.

For rotating each depending shaft 27 from one extreme position to theother there is provided, as seen in FIG. 6, an operating arm 31 which issuitably clamped in place. At the distal end of the operating arm 31there is located an upstanding stud 32 on which a clevis 33 is pivoted.As seen in FIG. 6A the clevis 33 is provided with a hearing sleeve 33ahaving a Ipress lit and is journaled on the stud 32. Beveled ends33b--33b are arranged to receive O rings 33c-33c that seal lubricantwithin the bearing sleeve 33a and prevent the entrance of extraneousmaterial. A similar sealed bearing construction is employed for likeapplications in the switch structure 1. FIG. 6 shows the manner in whichthe clevis 33 is pivotally connected to a fitting 34 that, in turn, isclamped to one end of a link 35 in the form of a section of pipe.

At its other end the link 35 is clamped to a fitting 36 which extendsfrom an adjustable clevis assembly 37. At the other end of theadjustable clevis assembly 37 there is located a clevis 38 which, asshown in FIGS. 7 and 8, is pivotally mounted on a stud 38' that extendslaterally from a crank arm 39. It will be observed that a link 35 isprovided for operating each of the rotatable insulator stacks 22--22 andthat the links are connected to crank arms 39 which extend indiametrically opposite directions from a crank shaft that is indicated,generally, at 40.

As pointed out, the crank shaft 40 is shown more clearly in FIG-S. 7 and8 of the drawings and it will be understood that a similar crank shaftand link construction is provided for each pole 2 of the switchstructure 1. The crank shaft 40 includes integrally formed end plates41- 41 that are secured by bolts 42-42 to end plates 43-43. Shaftextensions or bearing spindles 44-44 extend from the end plates 43-43and are journaled in bearings 45- 45 that are carried by bearing supportplates 46--46 that are secured suitably to the outer sides of therespective elongated structural support 3.

As shown in FIGS. 1 Iand 12 intermediate shafts 47- 47, in the form ofpipe sections, constitute endwise extensions of the shaft extensions orbearing spindles 44-44 that extend from opposite sides of theintermediate structural support 3. Connectors 48-48 serve tointerconnect the adjacent ends of the intermediate shafts 47-47 and theshaft extensions or bearing spindles 4444. If desired, the connectorslil-48 can include flexible coupling members with some degree ofadjustment to accommodate misalignment between .the inter-mediate shafts47-47, to -avoid application of undue strain on the bearings 451-45, andto permit accurate synchronization of the operation of the three poles2. It will be understood that the outer ends of the intermediate shafts47-47 are similarly connected to shaft extensions or bearing spindlesextending from crank shafts, duplicates of the crank shaft 40, andmounted on the -outboard structural supports 3. This construction ineffect provides a single shaft that is common to the three poles 2 ofthe switch structure 1 with some degree of flexibility therein for theabove reasons. The axis of rotation of this common shaft extends atright angles to the planes containing the .axes of rotation of therotatable insulator stacks 22-22 of each pole 2. The manner in which amechanical connection is provided between the switch operating mechanism`6 and the shaft that is common to the three poles 2 will be describedpresently.

It is desirable that provision be made for permitting rotation of thecrank shaft 40 through slightly 1more than When such rotation takesplace the crank arms 39 are rotated in diametrically opposite positionsfrom their positions as seen in FIGS. 7 and 8. In order to permit thismovement the crank shaft 40 is provided with radially offset portions49-49 on opposite sides of the crank arms 39-39 in order to permit thelinks 35-35 to move to corresponding positions. It will be understoodthat the 180 movement of the crank shaft 40 corresponds to the 102rotation of the rotatable insulator stacks 22-d 22 and switch blades23--23 carried thereby. By suitably proportioning the operatingmechanism it is possible to achieve these diiferent degrees of rotation`as will be understood readily.

It is desirable to limit the movement of `the crank shaft 40 slightlypast the overcenter position in each extreme position for the purpose ofproviding a toggle locked -operating mechanism. In order to accomplishthis with a high degree of accuracy a stop arm Slis formed integrallywith the crank shaft 40 and extends radially therefrom for engaging oneor the other of stops 52-52 that are carried by and extend upwardly froma horizontal plate 53 that is located along the lower side of therespective elongated structural support 3. When this arrangement isemployed there is a relatively large movement of the crank shaft 40 fora relatively small endwise movement of the links 35--35 interconnectingthe crank arms 39-39 and the rotatable insulator stacks 22-22. At oneextreme position this facilitates resistance to opening movementincident to corrosion, icing and the like. At each end of the movementbetween open and closed position, .the toggle action causes the rotationof the insulator stacks 22-22 and switch blades 23-23 to be slowed downfrom an otherwise high intermediate speed. This reduces the stressincident to stopping the moving parts at the extreme positions. Thetoggle locked operating mechanism, including the crank shaft 40,provides for more positive latching of the mechanisms in the mechanismhousings 24-24 and makes the operation less critical. Also in theextreme position corresponding to the closed position of the switchblades 23- -23 it facilitates the movement thereof into full contactengagement and overcoming resistance `to such movement at substantialmechanical advantage.

The details of construction of each of the poles 2 of the switchstructure 1 are identical as described hereinbefore except for thecommon drive to the intermediate pole 2. For this purpose, as shown inFIG. 8, a driven sprocket 54 is interposed between the end plates 41 and43 at one end of the crank shaft 40 and a sprocket housing 55 isprovided for shielding it and a chain 56 that is trained thereover. Forthe other two poles 2, instead of the driven sprocket 54, a spacer isprovided which -is merely a circular flat plate in order to permitstandardization of parts for the several poles.

Referring now to FIG. 9, it will be observed that the chain 56 extendsthrough flexible c-onduits `57--57 that communicate with one side of thesprocket housing A55. At the ends of the chain 56 adjustable links 58-58are connected and they extend through the flexible conduits 5757 forconnection to the ends of a chain 59 that is trained over a drivesprocket `60 which is located within a sprocket housing `61 that ismounted on one end of the intermediate structural support 3. Thearrangement is also illustrated in FG. where it will be observed thatthe drive sprocket `60 Iis mounted on a shaft 62 that is suitablyjournaled on the structural support 3 and has mounted thereon a bevelgear 63 which meshes with la bevel gear 6d that is fast on the upper endof the vertical shaft 7 which extends from the switch operatingmechanismo.

It will be understood that, on suitable operation of the switchoperating mechanism 6, the vertical shaft 7 is rotated in one directionor the other for opening or closing the switch blades 23-23 of each ofthe poles `2.

FIGS. 11, 12 and 13 show an alternate construction that can be employedin lieu of the switch operating mechanism t6 and vertical rotatableshaft 7. Here it Will be observed that the shaft l62, previ-ouslydescribed, has been omitted and a longer shaft y67 has been substituted.It will be understood that the shaft `67 carries the drive sprocket 60thereon for rotation herewith. At the outer end of the shaft 67 there ismounted .a radial arm 68 to which a clamp connector `69 is secured forconnection to the upper end of 'a link 70 in the form of a length ofpipe. The lower end of the link 70 is connected to a crank arm A71 thatis arranged to be rotated by a switch operating mechanism that isindicated at 72. The switch operating mechanism '72 can 'be constructedlas described in yJohn I. Mikos U.S. Patent No. 2,796,478, issued Iune18, 1957, and arranged either for manual or remote operation. Since theswitch operating mechanism 72 is arranged for direct connection to theradial arm `68 that is located to one side of the structural support 3,the switch operating mechanism 72 is located on the same side of theupright structural support it adjacent thereto.

The mechanism for rotating the rotatable insulator stacks 2222 of eachpole is located within the respective box like elongated structuralsupport 3. This makes it feasible to protect the moving parts, such asthe stop arms 28, operating arms 31, links 35, crank arms 39, etc., fromicing which would interfere and possibly prevent operation of the switchstructure 1. For this purpose as seen in FIGS. l, 12 and 13, side iceshields 73a and 7312 are secured to the sides of the structural support3 and top ice shields 74a and 74b overlie the upper side at locationsproviding protection against icing for the underlying moving parts. ltwill be understood that each structural support 3 is provided with iceshields 73a, 7'3b, 74a and 74b although, for the sake of clarity, onlyone of the supports 3 in FIG. 1 is illustrated as being so protected.

It is desirable that means be provided for controlling the rotation ofthe common drive shaft which includes the intermediate shafts 47-47 andthe crank shaft 40 in order that the operating sequence under thecontrol of the mechanisms in the mechanism housing 24-24 can function tocontrol the operation of the circuit interruptcrs -25 in the desiredsequence with respect to the movement of the switch blades 23 23.Accordingly, as shown in FIG. 2 of the drawings, there is provided acontrol mechanism, indicated generally at 75, for this purpose which maybe constructed as shown in the above identified Barta Patent No.2,978,558.

While the toggle locked operating mechanism, which includes the crankshaft dii, has been described as particularly useful for rotating thetwo insulator stacks 22-22 and the associated switch blades 23-23 andoperating the circuit interrupters 25-25, it will be understood that itcan be employed for operating less than all of these elements. Forexample, one of the circuit interrupters 25 can be omitted while stillusing the two switch blades 23-23 operated by the rotatable insulatorstacks 22-22. Under certain operating conditions the use of only asingle movable switch blade 23 may be required together with theassociated circuit interrupter 23 as described in US. Gussow et al.Patent No. 3,030,481, issued April 17, 1962. In such case only a singlerotatable insulator stack 22 is required together with the over centertoggle connection to the crank shaft 40.

What is claimed as new is:

l. A high voltage switch comprising: a pair of insulator stacksrotatably mounted at one end of each stack in parallel spaced relation,a switch blade extending radially from the other end of each insulatorstack for movement therewith into or out of contact engagement at theirdistal ends on conjoint rotation of said insulator stacks in oppositedirections to effect said contact engagement or disengagement, anoperating arm extending radially from said one end of each insulatorstack, a crank shaft rotatable about an axis between said one ends ofsaid insulator stacks, a pair of crank arms one for each insulator stackextending diametrically from and rotatable with said crank shaft, a linkinterconnecting the distal end of each crank arm with the distal end ofthe operating arm of the respective insulator stack, stop meanscooperating with said crank shaft to limit rotation thereof in eitherdirection after rotation of said crank shaft and therewith said crankarms through at least from one over center toggle locked position toanother over center toggle locked position corresponding to rotation ofsaid switch blades into contact engagement in switch closed position andout of contact engagement in switch open position, and means forrotating said crank shaft in one direction or the other from one togglelocked position to the other toggle locked position to swing said switchblades in opposite directions and cause accurate endwise telescopingContact engagement of said distal ends thereof as said switch bladesapproach and recede from endwise in line engagement whereby said switchblades are aligned in switch closed position and are movable at highspeed between closed and open positions.

2. The invention, as set forth in claim 1, wherein the links arepivotally connected to the operating arms, are pivotally connected toopposite sides of the crank arms, and extend across the axis of rotationof the crank shaft in one over center toggle locked position.

3, The invention, as set forth in claim l, wherein the axis of the crankshaft extends at right angles to the plane of the insulator stacks.

4. The invention, as set forth in claim 3, wherein the crank shaft isoffset radially adjacent each crank arm to receive the respective linkin the one over center toggle locked position.

5. The invention, as set forth in claim 1, wherein additional stop meansindividual to each insulator stack limits rotation thereof at the switchclosed and switch open positions.

6. The invention, as set forth in claim 1l, wherein: an elongatedsupport carries the insulator stacks and has mounted therein theoperating mechanism for rotating said insulator stacks, and shield meanson the top sides of said support overlie the moving parts of saidoperating mechanism to protect the same against icing.

7. The invention, as set forth in claim Il, wherein: an elongatedsupport carries the rotatable insulator stacks, a stationary insulatorstack is mounted at one of its ends on said support in paralleloutwardly spaced relation adjacent to at least one of said rotatableinsulator stacks, a current interrupter is mounted on the other ends ofthe adjacent rotatable and stationary insulator stacks, and

I means rigidly support the one end of said stationary insulator stackon said support.

8. The invention, as set forth in claim 7, wherein the means rigidlysupporting the stationary insulator stack on the elongated supportincludes: a metallic support extending from said one end of saidstationary insulator stack through said elongated support, and means forclamping individually each end of said metallic support to therespective side of said elongated support.

9, In combination: A support structure, an insulator stack carried atone end by said support structure, a metallic support extending fromsaid one end of said insulator stack through said support structure7said metallic support having one end adjacent said insulator stack .andanother end remote therefrom, and means for clamping individually eachend of said metallic support to the respective side of said supportstructure.

10. The invention, as set forth in claim 9, wherein the means forclamping the end of the metallic support adjacent the one end of theinsulator stack to the adjacent side of the support structure includes:a rectangular metallic plate through which said metallic support extendsand to which it is rigidly secured, and adjusting member at each cornerof said metallic plate for adjusting the spacing between it and thejuxtaposed surface of said support structure, and retaining means forholding each said corner in adjusted position to said support structure.

11. The invention, as set forth in claim 9, wherein the means forclamping the end of the metallic support remote from the one end of theinsulator stack to the adjacent side of the support structure includes:a rectangular metallic plate secured to said support structure andhaving said remote end of said metallic support extending looselytherethrough, and adjustable clamp means on said metallic plate inangular spaced relation around said remote end of said metallic supportfor rigidly clamping the same.

References Cited by the Examiner UNITED STATES PATENTS Re. 23,91512/1954 Gilliland et al. 200-48 1,723,837 8/ 1929 Austin 200-4-82,048,106 7/1936 Coil 74--17.5 2,094,087 9/ 1937 Wilkins 200-482,095,796 10/1937 Crabbs 200-48 2,539,906 1/1951 Higgins 74-l7.52,685,004 7/1954 Lindell 200-48 2,878,331 3/1959 Tjellstedt 200-482,978,558 4/1961 Barta 200-48 X 3,192,332 6/1965 Bernatt et al 200-483,194,928 7/1965 Mikos 200-48 X 3,196,226 7/1965 Bertling 20G-*48FOREIGN PATENTS 843,009 3/ 1939 France.

ROBERT K. SCHAEFER, Primary Examiner.

BERNARD A. GILHEANY, KATHLEEN H. CLAFFY,

' Examiners. W. C. GARVERT, Assistant Examiner.

1. A HIGH VOLTAGE SWITCH COMPRISING: A PAIR OF INSULATOR STACKSROTATABLY MOUNTED AT ONE END OF EACH STACK IN PARALLEL SPACED RELATION,A SWITCH BLADE EXTENDING RADIALLY FROM THE OTHER END OF EACH INSULATORSTACK FOR MOVEMENT THEREWITH INTO OR OUT OF CONTACT ENGAGEMENT AT THEIRDISTAL ENDS ON CONJOINT ROTATION OF SAID INSULATOR STACKS IN OPPOSITEDIRECTIONS TO EFFECT SAID CONTACT ENGAGEMENT OR DISENGAGEMENT, ANOPERATING ARM EXTENDING RADIALLY FROM SAID ONE END OF EACH INSULATORSTACK, A CRANK SHIFT ROTATABLE ABOUT AN AXIS BETWEEN SAID ONE ENDS OFSAID INSULATOR STACKS, A PAIR OF CRANK ARMS ONE FOR EACH INSULATOR STACKEXTENDING DIAMETRICALLY FROM AND ROTATABLE WITH SAID CRANK SHAFT, A LINEINTERCONNECTING THE DISTAL END OF EACH CRANK ARM WITH THE DISTAL END OFTHE OPERATING ARM OF THE RESPECTIVE INSULATOR STACK, STOP MEANSCOOPERATING WITH SAID CRANK SHAFT TO LIMIT ROTATION THEREOF IN EITHERDIRECTION AFTER ROTATION OF SAID CRANK SHAFT AND THEREWITH SAID CRANKARMS THROUGH AT LEAST 180* FROM ONE OVER CENTER TOGGLE LOCKED POSITIONTO ANOTHER OVER CENTER TOGGLE LOCKED POSITION CORRESPONDING TO ROTATIONOF SAID SWITCH BLADES INTO CONTACT ENGAGEMENT IN SWITCH CLOSED POSITIONAND OUT OF CONTACT ENGAGEMENT IN SWITCH OPEN POSITION, AND MEANS FORROTATING SAID CRANK SHAFT IN ONE DIRECTION OR THE OTHER FROM ONE TOGGLELOCKED POSITION TO THE OTHER TOGGLE LOCKED POSITION TO SWING SAID SWITCHBLADES IN OPPOSITE DIRECTIONS AND CAUSE ACCURATE ENDWISE TELESCOPINGCONTACT ENGAGEMENT OF SAID DISTAL ENDS THEREOF AS SAID SWITCH BLADESAPPROACH AND RECEDE FROM ENDWISE IN LINE ENGAGEMENT WHEREBY SAID SWITCHBLADES ARE ALIGNED IN SWITCH CLOSED POSITION AND ARE MOVABLE AT HIGHSPEED BETWEEN CLOSED AND OPEN POSITIONS.